physics question / mastering physics help?

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drewsifer06

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i really need a lot of help on this question. Also, if you know of somewhere to get the answers to mastering physics, that would be awesome. Here is kg the question:
A 4.50 block hangs from a spring with spring constant 1820 n/m. The block is pulled down 6.70 cm from the equilibrium position and given an initial velocity of 1.40 m/s back toward equilibrium.
What is the amplitude?
What is the total mechanical energy of the motion?
 
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